Adjustable reflector



Dec. 9, 1924 1,513,071v

w. SPENCER l ADJUSTABLE REFLECTOR Filed Oct. 3l, 1925` "2 Sheets-Sheet 1 W//VEJJEJ w. I un; H.. @wy/MM mm @gm TTORNEY S Dec. 9, 1924. 1,519,071

l w.k H. SPENCER ADJUSTABLE REFLECTOR Filed Oct. 51, 1923 2 SheetS-Sheet 2 W//VEJJIS INVENTOR BY www i? Patented Dec. 9, 1924.

UNITED STATES PATENT OFFICE.

WILLIAM H. SPENCER, OF NEW YORK, N. Y., ASSIGNOR TO 1'.. P, FRINK. INC.. OF NEW f 'YORK, N. Y., A CORPORATION 0F NEW YORK.

ADJUSTABLE RE FLECTOB.

Application ined october 31, 1923. serial No. 671,951.

T0 all @olivo/mi it may concern.'

Be it known that I, /VLLIAM H. SPENCER, a. citizen of the Ynted States, residing in the city, county, and State of New York, have invented certain new and useful 11uprovements in Adjustable Reflector-s, .of which the following' is a specification.

This invention relates more especially to reflectors for electric lamps of standard types which are made in different 4sizes according to the lighting effects, required of them.

The primary object of this invention is to provide an improved adjustable device whereby a given reflector may be adapted for use with various sizes of lamps as well as for the use of a given size of lamp in different lighting relations with respect to the reflector.. More specifically stated, the pres` ent invention contemplates a reflector which may be used with lamps of different sizes without varying the position of the lamp filament in relation to the reflecting surface. My invention also contemplates the provision of suitable means in a reflector for producing a variation in the light diffusion or spread of light with the same reflector and same lamp.

Other and further objects of invention will appear in the specification, reference being had to the accompanying drawings which exemplify my invention in a preferred embodiment and in which- Figure 1 is a vertical section of the reflector in collapsed position to adapt it for use with a 75 watt electric lamp, parts being shown in elevation;

Figure 2 is a. similar vertical section showing the telescopic neck in partly eX- tended position to accommodate a 100 or 150 watt lamp with the filament thereof maintained in the same relative position to the reflecting surface;

Figure 3 is a similar vertical section of the reflector having the neck fully extended to accommodate a 200 watt lamp with its incandescent filament held in the same relative position to the reflecting surface;

Figure 4 is a similar vertical section of the reflector in partially extended position showing a 75 watt lamp in a position intermediate to upper and lower positions to which the lamp may be moved by the adjustment of the telescopic neck g and Figure 5 is a fragmentary bottom plan viewfof the preferred form of reflector.

As shown in Figure 1 of the drawings, the reflector 1 is provided with an upwardly tapered neck 2 having its upper edge curved outwardly to form a collar i3. vWithin the neck portion :2 of the reflector is a telescopic extension section comprising a cylindrical portion 4t provided with an outwardly flared lower flange portion 5 having ayuniform degree of taper and around its upper edge with an outwardly curved collar 6 whfch as shown in Figure 1 is adapted to nest. within the collar 3 and to be supported thereby. Vithin the intermediate section of the collapsible neck is an inner section comprising a cylindrical portion 7 arranged within and slidably contacting with the cylindrical portion 1 of the intermediate section, a lower flared flange portion 8 having a uniform degree of taper and an upper outwardly flared collar 9 which nests within and is supported by the collar 6 of the intermediate section. Suitable means for supporting the reflector from a lamp socket 10, are provided in the present embodiment of my invention by a hood 11 suspended from said socket 10 and provided with a depending flange 12 within which the adjustable set screws 13 are mounted for engaging under the outwardly flared collar of the upper section of the telescopic neck or of two or more sections in collapsed position. As shown in Figure 1, the screws 13 are arranged to engage under the three nested collars 3, 6 and 9, since the neck sections are collapsed so as to bring the center of illumination 14 of an incandescent lamp 15 in predetermined position with respect to the reflecting surface of reflector 1.

According to F iigure 2 of the drawings, an incandescent lamp 16 is arranged within the reflector 1 so as to bring its light center 17 in the saine relative position to the refleeting surface as that occupied by light center 14 in Figure 1. For this purpose, the screws 13 are arranged to engage under the nested flanges 6 and 9 of the intermediate and inner sections ofthe telescopic neck, the lared lower edge 5 of the intermei collapsed, the light center of diate section being drawn into contact with the flared inner Wall of the section 2 of the reflector 1.

In the positions of the parts shown in Figure 3, the set screws 13 engage'under the flange 9 ofthe inner section 7 only, the telescopic sections being fully extended so that the flared lower edges 5 and 8 are nested Within the upwardly tapered neck 2 of the reflector' 1. By this adjustment, the light center 18 of the 200 Watt lamp 19 is brought into the same relative position to the reflecting surface of reflector 1 as that occupied by the light centers 141 and 17.

Referring now to Figure 1, the 7 Watt larnp 15, is shown with its light center l-'l raised above its-position shovvn in Figure l, by partly extending the telescopic neck ot the reflector. According to this ligure of the drawings, modifications of the light flux are shown by lines of different characters in connection `With the adjustment of' the 7 '.3 -Watt lamp with respect to the reflector 1. Thus, with the telescopic neck completely this lamp would lieat 20 so that the light tlux would be substantially the saine as that shovvn in Figure 1. The light flux for the middle positionfis represented on this figure by the dash lines originating 'from light center 1-t. The light flux for the uppermost position corresponding to the full extended position of the reflector neck, is shown in dash and dot lines to originate from the upper light center 21.

I claim 1. The combination with a reflector having an integrally formed upwardly contracted tapered neck provided with a flange turned outwardly from its smallest diameter at the top, of a section telescopically con` nected thereto and comprising an upper cy` lindrical portion slidably contacting with the inner wall of said tapered neck'at the top and a lower portion provided with a uniform 'taper adapt-ing it to be closely ernbraced by the inner tapered Wall of said reflector neck adjacent its smallest diameter.

2. The combination With a reflector havii'ig an integrally formed upwardly contracted and uniformly tapered neck, of a plurality of telescopically connected sections provided with. uniformly tapered lovver portions corresponding to the upper portion of said tapered neck and With progressively longer cylindrical portions, extending above said tapered lower portions, the upper edges of said tapered neck and the cylindrical portions of said telescopic sections being provided With outwardly turned flanges Whereby said reflector may be suspended at dif ferent elevations with respect to an electric light socket.

XVILLIAM H. SPENCER. 

